Cutting and scraping instrument



May 9, 1950 w. J. DU PONT CUTTING AND SCRAPINGINSTRUMENT Filed March 29, 1947 INVENTOR Patented May 9, 1950 UNITED STATES PTENT OFFICE CUTTING AND SCRAPING INSTRUMENT William J. Du Pont, Toledo, Ohio Application March 29, 1947, Serial No. 738,111

3 Claims. 1

This invention relates to a hand tool or instrument generally adapted to be used for trimming, paring and scraping operations and particularly useful in cutting callous tissues, corns and the like.

An object of this invention is to provide a device which retains the refuse resulting from its operation.

Another object of the invention is to provide a readily replaceable blade with means to firmly hold the blade in operating position and against any displacement even under the most severe uses to which the device may be put.

Still another object of the invention is to provide an attractive as well as satisfactorily operating implement of few and simple parts wherein the replaceable blade is held in proper relationship as to its mounting and may be quickly changed, and wherein the accumulations are retained until desired disposal.

Other objects and advantages of this invention relating to the arrangement, operation and function of the related elements of the structure, to various details of construction, to combinations of parts and to economies of manu-' facture, will be apparent to those skilled in the art upon consideration of the following description and appended claims, reference being had to the accompanying drawings forming a part of this specification wherein like reference characters designate corresponding parts in the several views.

Referring to the drawings:

Fig. 1 is a plan view of the device;

Fig. 2 is a side elevation of the device;

Fig. 3 is a view on the line III-III, Fig. 1;

Fig. 4 is a view on the line IV-IV, Fig. 3;

Fig. 5 is a fragmentary view on an enlarged scale, of a modified form of blade lock; and

Fig. 6 is a View on the line VIVI, Fig. 5.

The body of the device comprises a, unitary structure, preferably an attractive plastic molding having a pair of plate portions l0, I2, outwardly diverging from a common edge or junction [4, along which edge is slot I 6. End closures or walls I8, 2!), connect the outer ends of the plates, while cover 22 having snap connection with the plate portions remote from the edge l4 completes a normally closed chamber 24, rectangular in its lengthwise cross-section but triangular in shape through the width.

Extending inwardly from each of the walls I8, 20, adjacent the termini of slot [6, is a lug or stop 26 providing a seat 21. A rib 28 extends inwardly from each of the walls 18, 20, and is spaced from the plate 12 to provide guide-ways 30 between the ribs and plate. A blade 32 is positioned in these guide-ways and has the outer ends of its cutting edge 34 resting against the stops 2B. The stops and ribs provide the means for properly positioning the blade in the device. In position, the blade lies against plate I! and has its cutting edge 34 extending adjacent to and along the slot l6 while its remote edge 36 abuts the inner side of the cover 22, the cover serving to lock the blade in position against unwarranted shifting during normal use of the device.

To facilitate removal of the cover for access to the chamber 24, a niche 38 is provided in the upper edge of plate portion I2. Handle 40 extends from plate portion In and is of such size and shape as is desired for efficient holding and manipulation of the tool and is provided with opening 42 therethrough as means to hang the device for storage.

While the construction as described provides a satisfactory device, it has been found desirable to insure the blade locking in the device. The cover lock may be augmented in several ways. For example 9. lug 44 from the plate l2 may extend at least partially through an aperture 46 in the blade and, additionally, bolt 48 may pass through the plate and blade to engage spring nut 50 bearing against the blade. In this construction it is desirable to have the bolt head countersunk within the plate so the smooth outer face of such plate is uninterrupted.

An additional form of lock is shown in Figs. 5 and 6 which permits blade change without removal of the locking device. To this end lug 52 from the plate l2 may be of some keying shape as for example elliptic with the aperture 54 through the blade of corresponding form. Screw 56 has its head likewise of the same outline so that in one position it is in registry with the lug and the blade 32 may be removed or replaced and then by a partial turn of the screw the head locks the blade in position. A knurled collar 58 imbedded in the plate 12 provides a nut for the screw 56.

It is to be understood that the above detailed description of the present invention is intended to disclose an embodiment thereof to those skilled in the art, but that the invention is not to be construed as limited in its application to the details of construction and arrangement of parts illustrated in the accompanying drawings, since the invention is capable of being practiced and carried out in various ways without departing from the spirit of the invention; The language used in the specification relating to the operation and function of the elements of the invention is employed for purposes of description and not of limitation, and it is not intended to limit the scope of the following claims beyond the requirements of the prior art.

What is claimed and it is desired to secure by United States Letters Patent:

1. In a device of the class described, a pair of plates outwardly'diverging from a common edge, end closures between said plates, a slot along said edge terminating inwardly from said end closures whereby a seat is provided between each end of the slot and the adjacent end. closure, a rib extending inwardly from each end closure in spaced parallel relationship to one of said plates to provide a channel therebetween, a blade in said channel supported againsts'aid one plate and having its cutting edge adjacent to and along said slot with the cut-tingedge termmi restingin said seats, a cover between the other'ends of the plates remote from the com- =mon edge and interlticking Withsaid plates and abutting the-edge of the blade remote from its cutting edge to lock said blade in operative ipo- --sition in :said device, and a handle ext-ending Number from the plate diverging from the blade supporting plate.

2. The structure set forth in claim 1 wherein the blade supporting plate is provided with a lug extendin into a cooperating aperture in the blade.

3. The structure set forth in claim 1 wherein the blade supporting plate is provided with a lug and the blade has an aperture therethrough into which said lug extends, and means coacting between said lug andthe blade'to lock said blade to its supporting side.

WILLIAM J. DU PON'I'.

REFERENCES CITED Country Date France June 25, 1907 Number 

